Well...
1. There's me on design and data and writing and testing, and general project management and producer. I am doing basically no coding except for some engine-level stuff and GUI stuff and then data definitions and a few algorithms that are just easier to write the code for rather than trying to spec it out in pseudocode. Things like the combat damage calculations, etc.
2. Keith is doing 99% of the coding, and all of the important coding architecture.
3. Blue is working fulltime on art, and art direction. She's doing things like the GUI, a number of icons (resource icons, category icons, top bar icons, etc -- that's somewhere around 60 icons), and she's modeling the buildings in the appropriate perspective in Sketchup (and a few in Sculptris, specifically the Spire ones in particular). She's also responsible for doing a lot of the experimental "let's see how we can make this work at all" stuff with me. She also modeled all the vehicles, and there's a variety of other things. She's also painting the little scene images for the social progress screen.
4. Cath is working fulltime on art. She's done 318 individual terrain tiles in 53 terrain categories (all that is done), and she's so far done about 120 building tiles (though there are about 10 partially-complete buildings at the moment). Overall she's completed 66 of the currently-defined 94 human buildings, and she's fully completed 9 out of the 93 alien buildings. Though as I mentioned, another 10ish of those are mostly-complete but not marked off. She's been inventing the landscapes with me, and then originating the color styles for each of the races, too. Though Blue and I already originated the architectural style for the buildings of each race prior to that, it's still a big thing to figure out the colors and then paint in the many many details that were not modeled in sketchup. Overall there are about 560 tiles for her, and she's about 78% done, which is awesome.
5. Genna and Charity are both working part time on linework for the buildings and the vehicles. In order to go from sketchup to ready-for-painting, linework first has to be done. Cath was doing that at first, but we realized that with the amount of load we were putting on her, there was no way we'd be able to finish this in the goal timeframe. We wanted the coloring to be consistent, though, and so ideally to avoid bringing in other artists to do coloring on the terrain or buildings. So instead we brought in two to work on linework, which is time-consuming but a middle-stage process and not the final-stage process. Genna and Charity have both worked with us off and on since Nihon no Mura. Between them they did all the character and icon art for that expansion. They've also worked with us since then on a variety of smaller things, but this is involving them a lot more.
6. Marcin is also working part-time on art, although it's a hefty workload for him, too. He's sketched all 43 of the racial leaders thus far, and has fully colored all but 12 of those. There are a couple that we might revisit during the polish phase, though. Right now he's taking a break from that, though, and has been working on the tech tree icons and then the underground building icons. Right now there are 78 icons defined for specific underground buildings, and he's completed 43 of them. By the time I'm done with definitions on these, I expect there to be closer to 150. As far as techs go, I've defined about 79 at this point, with another 12ish that I simply need to write up and get into the tree (their buildings exist, but don't have the tech defined yet because I didn't have time). Out of these, he's completed 73 of the tech icons already, which you could see in the screenshots of the tech tree from a while back (which had his icons and then Blue's GUI). There will ultimately be between 100 and 150 techs, somewhere in there.
7. There are three cool promotional video shorts that are also backstory, and for those we have an animator named Julian working on them. Voice acting was done for these by Toby and Bronnie. Right now this is kind of a secret project. I'm doing all the audio editing and sound effects work here (and for the main game, I forgot), and I wrote all three of the shorts. Though Toby in particular helped enormously with refining the first short and adding in some improvisational lines.
8. Oh, goodness, how could I forget Pablo on music until this point? He's been working like crazy. He put together a really amazing theme song, and put together a choir to perform it consisting of a combination of some friends of his as well as "Vox Virorum," a male chorus from Durham, NC. That's a really incredibly piece. Then of course he's busy with the rest of the soundtrack as well.
9. Oh, I also forgot. We had an artist named Peter on a short-term contract to come in and animate the ground troops for the game. They are incredibly tiny so as to be in scale with the buildings (or close at least), so we wound up having to get someone who is both a painter and a pixel artist who could do something kind of in between. This was our first time working with Peter.
10. Oh, and we had someone else contracted through 99designs.com who did the logo.
11. Oh, and I'll be doing the particle effects for the game, like usual. I haven't had time to do any yet, though. Blue is doing atmospheric effects for the game, too, among other things. Thus far it's mostly been limited to the smog for the cities that are polluted, but there are some other cool things we have planned for her during the polish phase when the main body of art is already done.
So in all there are 5 of us fulltime: Blue, Cath, Keith, Pablo, and me. Then we have three long-term (about half a year) part-timers, Marcin, Genna, and Charity. Then we've had I suppose 5ish contractors who have come in to do something specific on a very short-term basis. Not counting the choir, which I'm not sure of the number of people involved there. A dozen or so, from the sound of it, but Pablo would know.
Oh, for the fun of it, the nationalities breakdown:
Americans: 9
New Zealanders: 2
British: 1
Swedish: 1
Lots of folks, anyway! But we've tried to segment things in such a way that everything is as cohesive as possible throughout the whole game,and I think we're succeeding in that. This is officially the largest project we've ever worked on, I feel quite confident in saying.